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Help alevel chemistry

Heya!
I think there might be something wrong with my calculator.

Whenever I calculate answers with my scientific calculator ( Casio calculator) the answer is always slightly different to the mark scheme- even though it’s the exact same equation.
I’ve tried to reset my calculator a few times and there’s no difference at all.
I’m worried that in the exams when the answers are marked mine are going to be slightly different to the ones in the mark scheme so I won’t be getting the mark.

Does anyone have any advise on what I can do with my calculator and the best mode to have it set for chemistry?

Thanks!

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